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The brake pedal went to the floor but the brake reservoir is…

The brake pedal went to the floor but the brake reservoir is still full

Mechanic's Assistant: Have you tried cleaning and oiling the brake pedal's pivot under the dash?

I checked all of that out last night all seems good under dash. could the problem be with the brake booster itself

Mechanic's Assistant: What is the model/year of your Ford?

1995 f150 4x4

Mechanic's Assistant: Are you fixing your F150 yourself? What have you tried so far?

I hope to. problem happened on my way home from work yesterday at about this time. the brake pedal went to the floor just as it would if a line had rusted out. but as I stated the reservoir is still full

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

This is usually the result of a bad master cylinder. If you're still full of fluid, then the master cylinder isn't pushing the fluid like it should. This could be due to pitting in the cylinder or the cups that push the fluid have gone bad. It's not that uncommon because over time moisture gets in due to condensation and causes the pitting. I would put a new master cylinder on it. The booster, if it fails, will make the brake pedal rock hard and if it's losing vacuum could cause the engine to run rough.

Please let me know if there is anything else I can do to help.

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What I would do next is lock the rubber brake hoses. They sell line lock pliers, or you can use vise grips. Just don't damage the rubber. Then press the brake pedal. If it still drops, there is still an issue with the master cylinder or air between the master and the calipers.

If not, then remove one at a time until the pedal goes to the floor. When it does, go to that area to look for a problem. Either a leaking wheel cylinder or brake caliper or something that's not working properly.

I really expected the master cylinder to be the problem here.

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Customer reply replied 6 months ago

I went thru a whole quart of fluid bleeding just the brakes alone and had nothing but clear fluid. And like yesterday the resevoir level has not changed. I'm baffled

I will tell you that...the things you have to go through to be an Expert are quite rigorous.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.